I don't degrade anyone, Swansea are a good midtable side with a formidable home record, nothing else. I'm talking of top clubs and you're talking of Swansea, who were just in Championship 2 seasons ago lol. Mata is a very good player with some flaws, but his strengths are among the best in his position and this is why his weaknesses can be worked around by most teams and managers. If Mata plays as RW or RB, he is still the most creative player on the pitch, but he doesn't have the pace for this position. Especially not now with Mourinho's counter attacking style, but he doesn't complain and still tries to do what the manager wants.